* {
	margin: 0;
	padding: 0;
}

#mainScreen {
	width: 512px;
	height: 768px;
	margin: 0 auto;
	position: relative;
	overflow: hidden;
}

.bg {
	width: 512px;
	height: 768px;
	position: absolute;
	background-image: url(./img/bg.jpg);
}

#bg2 {

	top: -768px;
}


#airplane {
	background-image: url(./img/plane.png);
	position: absolute;
	height: 62px;
	width: 50px;
	left: 230px;
	top: 650px;
}

.bullent {
	position: absolute;
	width: 9px;
	height: 21px;
	background-image: url(./img/bullent.png);
	background-size: 9px 21px;

}

.tank {
	position: absolute;
	height: 30px;
	width: 40px;
	background-image: url(./img/tank.png);
	background-size: 40px 40px;
}